Overview
Aluminum nitrate nonahydrate (CAS 7784-27-2 ) is a water-soluble aluminum salt supplied in crystalline hydrated form. It functions as a coagulant, corrosion inhibitor, and pH buffer across multiple industrial processes.
In water treatment, it acts as a coagulant and flocculant, destabilizing suspended solids and colloidal matter to clarify process and wastewater streams. This ensures efficient removal of impurities in large-scale systems.
Textile and leather processors use it as a mordant and tanning auxiliary, improving dye fixation and surface treatment uniformity on fiber and hide substrates. This chemical is essential for achieving consistent color results.
In pulp and paper manufacturing, it supports retention aid systems and controls pH during wet-end chemistry to improve sheet formation. This helps manufacturers maintain high quality and structural integrity in paper products.
Personal care formulators incorporate it at controlled concentrations for its astringent and antiperspirant buffering properties in topical preparations. It is valued for its stability and performance in cosmetic formulations.
The product is supplied as white crystalline granules or lumps, with purity typically ranging from technical to reagent grade. Standard commercial specifications include technical grade for industrial processing and higher-purity grades.
These higher-purity grades are aligned with laboratory and analytical requirements for precise testing. Packaging is available in bulk bags and smaller drum quantities to suit both large-scale industrial buyers and specialty formulators.
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Physical Properties
| Melting Point | 71.05 °C |
| Boiling Point | 100°C/760mmHg |
| Density | 1.375 g/cm³ @ Temp: 25 °C |
| Appearance | white crystalline powder |
| Color | White |
| Form | Solid |
| Water Solubility | 64 g/100 mL (25 ºC) |
| pH | 2.0-4.0 (50g/l, H2O, 20℃) |
| Log P | -0.129 (est) |
Safety & Handling
Danger GHS03 GHS05 GHS07 Hazard Statements H272 May intensify fire; oxidizer H315 Causes skin irritation H318 Causes serious eye damage H319 Causes serious eye irritation Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P220 Keep away from clothing and other combustible materials. P264 Wash … thoroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P321 Specific treatment (see … on this label). P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 28342980 |
| UN Number | 1438 |
| ADR Class | 5.1 |
| Packing Group | III |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 7784-27-2
- EC Number
- 616-523-8
- Mol. Weight
- 375.13
- HS Code
- 28342980
- Category
- Salts & Minerals